I (sadly) am not endorsed by Black Thorn. Black Thorn is a clean, beautiful, well-equipped dungeon located in the lovely Lake Merritt area of the San Francisco Bay Area. Featuring 5 themed play rooms, over 12 high-quality play stations, and all manner of implements, bondage gear, and accessories, Black Thorn is able to accommodate a diverse array of fetish and fantasy interests and role-play scenarios.